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Describing waves: amplitude, wavelength, frequency and v = fλ

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Key ideas

  1. Amplitude is the maximum displacement from the rest position, not peak to trough.

  2. Wavelength is the distance from one point on a wave to the same point on the next wave.

  3. Frequency is the number of waves passing a point each second (Hz); period T = 1 / f.

  4. Wave speed: v = f λ, with v in m/s, f in Hz and λ in m.